POSIX Functions
PHP Manual


(PHP 4, PHP 5, PHP 7)

posix_isattyDetermine if a file descriptor is an interactive terminal


bool posix_isatty ( mixed $fd )

Determines if the file descriptor fd refers to a valid terminal type device.



The file descriptor, which is expected to be either a file resource or an integer. An integer will be assumed to be a file descriptor that can be passed directly to the underlying system call.

In almost all cases, you will want to provide a file resource.

Return Values

Returns TRUE if fd is an open descriptor connected to a terminal and FALSE otherwise.

See Also

POSIX Functions
PHP Manual